The AirTAC GFR300-08 AirTAC Filter Regulator, 1/4 in PT, 5 um Filter is a genuine G-series filter regulator: water separation, 5 µm particulate filtration and balanced-type pressure regulation combined in a single body. It has PT1/4" ports, a manual drain and regulates 0.05 - 0.9 MPa (7 - 130 psi). It does not lubricate — add a GL lubricator, or order the GFC two-unit set, if downstream equipment needs oil.
The AirTAC GFR300-08 is a 300-size filter regulator that removes water and particulate from compressed air and sets downstream pressure in a single body. This configuration has a 1/4 in PT port, a 5 um filter element (the finer of the two catalogue grades), a manual drain on the polycarbonate bowl, and a round gauge reading in psi. The standard regulator adjusts from 0.05 to 0.9 MPa (7-130 psi) with manual drain, and the unit handles a maximum inlet pressure of 1.0 MPa (145 psi) at -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR line is available in 200, 300, 400 and 600 sizes with port options from 1/8 to 1 in, PT as standard and G or NPT as order options, drain choices (differential-pressure, automatic or manual), 40 um or 5 um filtration, gauge and scale choices, and an optional reverse/check valve. Flow is published as curves rather than a single rating, so we confirm the datasheet figures for your application on request.
| Model | GFR300-08 AirTAC Filter Regulator, 1/4 in PT, 5 um Filter |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (PT thread) |
| Filtering grade | 5 µm |
| Regulating range | 0.05 - 0.9 MPa (7 - 130 psi) |
| Pressure type | Standard type |
| Adjusting mechanism | Balanced type |
| Fluid | Compressed air |
|---|---|
| Max. working pressure | 1.0 MPa (145 psi) |
| Temperature range | -5 to +70 °C (unfreeze) |
| Drain type | Manual drain |
| Bowl material | PC |
| Pressure gauge | Fitted — round, psi scale |
| Reflux valve | Not fitted |
Specifications follow the official AirTAC G-series air-preparation data. The regulating band is set by the drain type: automatic and differential-pressure drains regulate 0.15 - 0.9 MPa, a manual drain regulates 0.05 - 0.9 MPa. Standard type, regulating 0.05 - 0.9 MPa (7 - 130 psi). Air must not freeze in the unit. Flow curves, weight and outline dimensions are not published in our data set — ask us and we will confirm from the factory datasheet.
| GFR300 | G-series filter regulator, 300 body — sets the port range. |
|---|---|
| 08 | Port size PT1/4". This body offers 08 = PT1/4", 10 = PT3/8", 15 = PT1/2". |
| M | Drain: Manual drain — this also sets the regulating band (0.05 - 0.9 MPa (7 - 130 psi)). |
| (blank) | Standard type. Blank is standard, L is the low-pressure type. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. C is round, F is square. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| W | Filtering grade 5 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| (blank) | PT thread. PT is the default; G is BSPP and T is NPT. |
| (blank) | No reverse-flow valve (the default). |
Field order is size, port, drain, type, bracket, gauge, shape, scale, grade, thread, reflux — a blank position takes the default. Example: GFR300-08 is a 300 body, PT1/4", differential drain, standard type, bracket included, gauge fitted, 40 µm, PT thread, no reflux valve.
A larger body carries a larger port and holds set pressure better as flow rises. AirTAC publishes flow only as curves, so size the body from your peak demand with headroom. The GFR600 uses an aluminium-alloy bowl; the 200, 300 and 400 bodies use PC.
| This model | GFR300 · PT1/4" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Feeding a bench-mounted pneumatic press or clamping fixture, where the 5 um element protects the valve train and the regulator sets a stable working pressure for consistent forming and clamping force.
Conditioning air for carton sealers, case packers and conveyor diverters, where the manual-drain bowl is bled during shift checks and the regulator holds the pressure the cylinder and gripper circuits were set up for.
Supplying point-of-use drops on an assembly line, where the round psi gauge gives operators a local pressure readout and the 5 um filtration keeps air tools, torque drivers and fittings free of water and fine debris.
Start with the port step: 300 size carries 1/4 in PT here, and larger sizes (400, 600) move up to bigger ports and higher flow capacity, so match the size to the air demand of the circuit rather than to the pipe alone. Choose the drain to suit access: this unit has a manual drain, which suits attended installations where an operator can bleed the bowl; automatic or differential-pressure drains suit unattended lines. The 5 um element (code W) is the finer choice for sensitive downstream equipment; 40 um is the standard grade for general protection. Gauge scale (MPa, psi or bar) is a selection choice, and this unit is supplied with a round psi gauge. Thread is PT as standard, with G (BSPP) and NPT available to order; a mounting bracket is included. Because flow is published as curves rather than a single rated figure, ask us to confirm sizing against your application before ordering.
Quick checklist
The PC bowl must not be cleaned with solvents — wipe it with a dry cloth. Without the K option, air cannot flow back through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for the GFR series as curves, not as a single rated number, so there is no one flow figure we can quote for this 300-size, 1/4 in unit. Send us your application's air demand and we will confirm the flow behaviour from the datasheet curves before you order.
The M in the code GFR30008MC2W selects a manual drain on the bowl: collected water is released by hand rather than automatically. It suits attended installations where an operator can bleed the bowl as part of routine checks. For unattended lines, the GFR300 is also available with automatic or differential-pressure drains.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity, thread type (PT / G / NPT), gauge scale and destination. We confirm price, availability and lead time — usually within 7-8 hours.